Marine motor construction



Oct. 19, 1937. J w H Y 2,096,037

MARINE MOTOR CONSTRUCTION Filed June 26, 1935 s Sheets-Sheet 1 Jam es[Al/far vey I VENTOR ,KrToRNEY J. W. HARVEY MARINE MOTOR CONSTRUCTIONOct. 19, 1937.

5 Sheets-Sheet 2 Filed June 26, 19 33 James- MHarrI/ey INVENTOR TTORNEYOct. 19, 1937 J. w. I IARVEY 2,096,037

MARINE MOTOR CONSTRUCTION Filed Julie 26, 1933 3 Sheets-Sheet 3 James W.Harvey,

INVENTOR l I r A RNEY Patented Oct. 19, 1937 UNITED SA S MARINE MoronooNs'raUo'noN James Willard Harvey, Winthrop, Maine, assignor I toRobert S. Allyn, New York, N. Y.

Application June 26, 1933, Serial No. 677,652

I7 Claims.

My invention relates particularly to constructions of the type of myformer Patents 1,786,997,

1,824,887, 1,840,948 and 1,874,988, in which a gas Another object is toprovide a construction of this character having a simple but effectivecooling system for the motor.

Another object is to provide a constructionof this character whichexhausts under water without material loss of effectiveness of themotor.

Another object is to provide in such a construction an underwaterexhaust which-does not change or interfere with the action of thepropeller. 7

Another object is to provide a simple type of hinged joint for thetilting motor unit which holds the parts securely in place in normaloperation but which permits the motor to be readily inserted andremoved.

Another object is to provide a construction which will automaticallydrain the casing without decreasing the efficiency of the propeller.

Fig. 1 is a longitudinal sectional view and side elevation showing oneform of construction involving my invention, the parts being shown in 7full lines in the running position and in dotted lines in the tilted orretracted position.

Fig. 2 is a detail rear view of a modified muffler construction.

Fig. 3 is a plan View of the propeller and pump housing with the shaftand support in section.

Fig. 4 is a rear View of the motor housing and the vertical shafthousing with the exhaust chambers.

Fg. 5 is a section on the plane of the line'5"5 of Fig. 4 lookingupwardly at the lower end of the vertical shaft and exhaust housing.

Fig. 6 is a horizontal section and plan on the plane of the line 8 ofFig. 4 but rotated 180. 45 Fig. '7 is a bottom planview of the exhaustand water drain member.

Fig. 8 is a plan View showing the casing with the vertical housingsectioned on the plane of the water drain passages.

Fig. 9 is a side view of the exhaust and water drain member.

The casing W is formed of any suitable material and has a flange l Iwhich is adapted to be secured to the bottom of the boat. The floorplate 55 I2 of this casing has an opening l3 in'whichthe motorsupporting plate M is supported when the parts are in therunningposition.

A motor of any suitable type is normally supported by the plate I4.

A sleeve member preferably of skeleton forma- 5 tion has a bottom ringl5 and a top ring [6 and a bottom flange Hi. This sleeve member also hasa cylindrical flange 13 which fits in a corresponding opening in thebottom plate [4. The sleeve is secured to the bottom plate, forinstance, by a plurality of screws H.

A bracket l9 issecured to the sleeve by means of bolts or cap screws 28,20. The front end of .the bracket is pivotally supported in the frontend of the casing, for instance, by means of a pair of lugs 2! which'may be cast integral with the casing or detachably carried by a wallthereof.

To facilitate insertion and removal of the unit the lugs 2| are providedwith inclined slots 22 adapted to receive the hinge pins 23 carried bythe bracket.

The motor head 25 includes the usual crank case and cylinders 26 and issupported by the vertical intermediate housing 21 to which it is securedby a number of bolts 24. The vertical drive shaft 28 is connected to theusual crank shaft in any desired manner. The intermediate housing 2! hasa laterally projecting flange 29 which is supported on a suitablebushing 30, for instance, of fibre or rubber in the upper sleeve ring[6. This upper sleeve ring is preferably split and provided with a clampscrew 31 by which it may be tightened so as to permit adjustment of thepressure of the ring on the housing 21. A bearing ring or bushing 32 isalso preferably provided inside of the lower sleeve ring l5.

The lower housing member includes a ring 33 which flts within theannular flange or collar l8 of the sleeve member. This ring also has anopening 3% which receives the flange 35 which projects downwardly fromthe intermediate housing member 27. The ring is detachably secured tothe intermediate housing member by screws 36.

The tubular member 31 constitutes a housing for the shaft 28 and isprovided with a flange 31. which is clamped between the flange 21 of theintermediate housing and the lower face of the crank case 25 by thescrews 24.

The lower housing member 38 contains the usual bevel gear transmissionand supports the propeller 39 and its shaft 40. This housing member hasa tubular extension 38 which extends upwardly into the lower end of. thetube 3! and is secured by screws '38".

In some cases the tubular'me'mber 37 may be V omitted and the extension38 of the propeller housing secured directly in the underwater mem ber45.

' ber 45 through passagesfli. V V V Itwill thus be seen that the exhaustfrom the l motorcylinders passes through the. castings42 i and throughthe chamber 4|, the passages 46 and the exhaust member or nozzle 45. Thelatter is. flattened and flared toward the outlet end the chamber 4| isconnected to the exhaust memwhich is located above and considerably anthe propeller 39 so that the exhaust gas can not possibly mix into thewater afiected by the. propeller. In this way I prevent the seriousinterference with the propeller ;action' which takes place when theexhaust gases are allowed to escape into the 'waterin 'front of oradjacent the. propeller. A considerable length of the nozzle 45 beingspaced apartfrom :the bottomplate I4, Wateripasses around it and aidsindrawing Y out the gases.

. The tapering of the exhaust extension 45 insures a'maximum velocity ofthe exhaust gases 7 as the boatmoves through the water;

In the modification sh owniin-v Fig. 2 .a single;

. casting 42 is substitutedfor ;.the two castings .42. 42 previouslydescribed and the, two motor cylinders exhaust into opposite sides. ofthe cast-f V 1 ing, which thus constitutes a. primary expansion Ichamber and mufller which discharges into the 1 upper end of theintermediate housing; member :For'that purpose I preferably provide somesuit- ..the desired cooling channels.

be driven byia cam 41' on the end of the propeller shaft,;as. shown inFig, 1.

: of course, be provided with the usual valves and 21. This singlecasting" may be secured to the motor cylinders by screws 43? and to thehousing 27 vbyscrews 44'. V V V In motors of this character it isdesirable. to provide forced feed cooling water for the cylinders andsometimes for the exhaust manifold.

j able formfof pump 41 for picking up water from in'front ofthepropeller and forcing it through a This pump may;

for convenience in .assembly the pump structure is provided Withaprojecting nipple 48 which pro- J'ects into the passage 48 and into thelower 'end of the Water passage 49 in the intermediate .housin'g. I 1

In some constructions a suitable form of rotary pump may be used on thevertical shaft between the vertical housing and the underwater'housingtir V V 'One or more-pipes or conduits Snare connected. 1 to theupper end ofQthe waterpa'ssage49'for de- 7 livering the cooling water tosuch parts of the" 'motor ias may be desired. f

Thewater is discharged from the outlets 5l into the casing ID. 'Adischarge elbow or pipe ';5l' may be provided if desired for thedischarge outlets.

In the form shown in Fig. 2; the'cooling water traverses the coolingwaterpassages and: is discharged into the casing through outletpipes5|".

tion p'ass'age 52 located immediately in front of Such a-pump will,

v The outlet member is provided with an educthepath of the propellerblades. The ring l5 7 2,096,637 r r V r is provided with a slot 53 and.the lower end of the housin'g 21 is provided with apassage 52 Whichconnects the. slot 53 with the upper end of the passage 52. When thepropellerjis rotating it draws the water out of the casinglll l When thepropeller is used for steering as well as forward 1 through the passages53, 52 and 52.

propulsion, it is desirable'to have the opening 53 elongatedhorizontally so that connection with the passage 52 is maintained whenthe: motor housing is rotated on its verticalaxis. I Agroove 7 54 mayalso be provided to' insure co ntinuity of :Th'etaperirig side walls52x01? the water outlet 'expedites 'thewater eduction .by the propeller.

It will thus be seen that the propeller serves not only to take care ofany water which may leak into the casing ID from the bottom but'it alsoserves to remove the cooling waterwhich isdischarged into the casingfrom the motor cylin ders, mufiier, etc. a

8 By discharging the. cooling water into the c'asing there is always asupply of water. to keep the discharge passage when'the motor housing.is rotated so as to reverse Ithe direction of propulsion. s

the drain outlet 52 'filled or sealed so that but little if any air isdrawn through the passage V 52 whichwould interfere with the elficiencyofi the propeller. a

For convenience in carrying the motora handle Fig. 1. 1

When .the motor is in place, as shown in l,.it is obvious that it cannot 'be lifted in a. straight line vertically because of the upper wall0. r 55 may be provided which connects the gas tank.

56 with-the intermediate housing 21, as shown in o'fthe inclined slot 22and its relation to the hinge pin 2 3.. By tilting the motor, however,into the dotted line position the motor may be withdrawn.

diagonally toward the left, asviewed in. Fig 1'; Of course, the motormay beinserted into'position in .a reverse manner.

The weight ofthe motor and attached parts,

serves to hold him position but in (case anob- 1 struction is met thepropeller. housingswings about the axis of the hinge pins 23 into thedotted" position so as to clear the obstruc-tion'without" damage... Ofcourse, the propeller may be'similarly retracted. by. hand when desired.'When? driving the boat forwardly'the pressure. of the propeller againstthe Water transmits force,

gagement of the bottom plate 14 in the opening being above the level ofthe bottom plate, the

pressure of the propeller tends to hol d the bottom plate l4 on'itsseat. The weightof the motor,

through the hingepins 23 and through thejfen- 5 Z l3'in' the floor'ofthe casing. These hinge pins of course, also aids in holding it in itsnormal 7 running 'positionJ The height of the hinge pins; however,should not b'eto'o greater the motor can not tiltread ily when thepropeller housing strikes an obstruction.

The 'partsare so arranged that thepropellen" retracts freelyjwithin thecasing when the boat is going forwardly; When the propeller housing isreversed to drive 'thexboat to the'rear, the

. exhaust member 45, of. course, extends underthe' 'iioorl2 of the;casing and-prevents. the tilting iaction. -J V The constructionas shownand described makes 1 it possible to machine the; various parts by con-5 ventional and practical methods. 7 I claim: 7

'1; 'In a motor installation, a floor plate having an opening, a closureplate fitting the opening and having a passage, a sleeve having a collarfitted in'said passage, a vertical housing having an exhaust chamber androtatably supported in said sleeve and having a projecting collar, an exhaust member secured to the housing and having a portion fitting betweensaid collars, a propeller unit carried by said housing beneath theclosure plate, said exhaust member having its inlet connected with saidhousing chamber and having a discharge outlet considerably in rear ofthe propeller. Y i

2. A motor unit comprising a bottom plate, a sleeve secured to saidplate, a housing supported rotatably in said sleeve and having anexhaust chamber, a tubular member extending through said housing andsupported at the upper end thereof, a propeller unit carried by thelower end of.said.tubular member and an exhaust member secured to thelower end of the housing and having an inlet connected to the exhaustchamber and an outlet discharging above and in rear of the propellerunit.

3. A motor casing unit comprising a removable bottom plate for thecasing, a sleeve secured to the upper surface of the plate, a motor andvertical intermediate housing supported and rotatable on said sleeve,said motor having a cooling chamber discharging into said casing, anunderwater unit detachably secured to the intermediate housing androtatable therewith, said underwater unit including a propeller and apump driven by the motor for picking up water and forcing it to themotor cooling chamber, said underwater unit having an inlet in thecasing above the bottom plate and an outlet located adjacent thepropeller whereby the cooling wa-. ter is discharged from the motor intothe casing and drained from the casing by the action of the propeller.

4. A motor casing construction comprising a floor plate having anopening, a bottom plate fitted in said opening and having an opening, asleeve member having a portion fitted in the latter opening, a verticalhousing rotatably supported in said sleeve, and an underwater housingsecured to said vertical housing and fitted in a portion of the sleeve,said underwater housing and said vertical housing having interfittingvertical walls.

5. In a motor unit, a circular bottom plate having a circular openingnear one edge, a sleeve secured to the plate and having a collar fittedin said opening, a vertical exhaust housing mounted in said sleeve andhaving a chamber, an underwater housing fitted within said collar andsecured to said vertical housing with an exhaust outlet connected withthe exhaust chamber.

6. In a motor unit, a bottom plate having an opening, a sleeve carriedby said plate, a vertical housing rotatably mounted in said sleeve andhaving an extending flange, an underwater housing extending within saidopening and secured to said vertical housing around its flange.

7. In a motor unit, a bottom plate having an opening, a sleeve securedto said plate, a vertical housing mounted in said sleeve and having awater passage, an underwater housing having a flange fitted in the lowerend of said housing and secured to the vertical housing, and a coolingwater pump having a discharge nipple extending through said flange intosaid vertical housing passage.

8. A motor unit comprising a casing having an opening in the rear of itsfloor plate and having lugs in the front end of the'casing.-.with

inclined bearing slots open at the top and 'in-- whereby the power unitcan only be demounted by first retracting the propeller into the casing;9. As an article of manufacture, an underwater exhaust mem er for a gasengine comprising an annular ring adapted tobe secured to" the lower endof a vertical'shaft housing and a rearwardly extending exhaust outletextension with an en trance through said annular ring, said extension 1flaring laterally outwardly'toward the rear and tapering to a rear edgewhich is vertically thin ner than at the end near the ring and offsetbelow the plane of the ring. I 1 1 10. As an article of manufacture, anunderwater exhaust member for a gas enginecomprlsing an annular ringadapted to be secured to the lower end of a vertical shaft housing and arearwardly extending exhaust outlet extension with an entrance throughsaid annular rin said, extension flaring laterally outwardly toward therear and tapering to a rear edge which is vertically thinner than at theend near the ring and ofiset below the plane of the, ring, and a lowerportion having a .water outlet in position to coact with the propeller,the side walls of the lower portion inclining toward each otherrearwardly to the outlet.

11. A motor unitcomprising a vertical shaft and intermediate exhausthousing, a cylinder mounted on the top of. the housing, a propeller andunderwater housing connected to the lower end of the vertical housing, amufiler secured to the cylinder and connected to the vertical housingand an exhaust outlet connected to the underwater housing anddischarging aft of the propeller so as to prevent slip. V

12. In a motor unit, a vertical shaft,'an intermediate housing on theshaft, a sleeve supporting said housing, a depending flange on saidhousing, a mufiier device below said housing, means of connectionbetween the housing and muffler including a ring surrounding thedepending flange and a depending flange on said sleeve surrounding saidring.

13. As an article of manufacture, an underwater discharge member for agas engine having a ring for attachment to an exhaust housing, anexhaust eduction member projecting rearwardly from the ring and atapered water outlet extending beneath'the exhaust eduction member.

14. As an article of manufacture, a plate hav- I ing means forattachment to an exhaust housing, a fiat exhaust extension beneath andin rear of said plate, and a water outlet tapered rearwardly from saidplate and beneath the exhaust member and discharging in front of thedischarge end of the exhaust member.

, 15. A motor unit comprising a cylinder casting, a tubular shafthousing secured to said casting,

nal-combustion power unit connected to. the upper end ,and'a propelleron a horizontal shaft geared. V to the lower end of themain shaft; a.vertical main 7 housingsurrounding the main shaft and supporting thepower unit and'having an exhaust chamber connected to the exhaust outletof the power unit, an-outlet 'member secured to the lower end f nectedwith the exhaust chamber injthe main housing and discharging theproducts oI-combustion from the motor well'in rear-of and above thelevel of the upper edge of the propeller and below the bottom; platewithout disturbing, the slipstream 'fromethepropeller. t J e 17. Agasengine compris1ng,;a crank case hav ing oppositely disposed cylinders,a-vertlcal housing secured tosaid 'caseandhaving amaln exhaust chamber;independent castlngs ea'ch hay ing an exhaust expansion chamberconnecting t a cylinder with the upper-part of the main exhaust Vchamber and'fon opposite sides thereof,.a verticalcrank shaft forthe'en'g ine mountediwithin the vertical housing, a propeller gearedtothe lo wer end of said shaft, a bottom plate ,cbnnectedftop a the lowerendiof the vertical housing and an underwater-exhaust connected tothelowerend I of. themain exhaust chamber'a'nd discharging 15V entirelyabove and in rear of theslip stream of the propeller and'below thebottom plate; 1 V V JA ES ILLARD a

